Abstract
The presence of isomeric levels with half-lives in the microsecond range has been identified in . Neutron-rich Cd isotopes were produced from the fragmentation of a 120 MeV/nucleon beam and uniquely identified through their time-of-flight, energy loss, and total kinetic energy. γ rays from these isomeric levels were measured with an array of Ge detectors that were gated for 15 μs by a particle implantation trigger from a stack of Si detectors. The γ rays observed in the decay of isomers populate low-energy levels previously identified in the β decay of . The γ rays found in the decay of isomers are consistent with expected yrast structures observed in lighter, odd-mass Cd isotopes. The appearance of these isomers at the point where exceeds 1.6 is interpreted as an indication of the onset of a weakened neutron-neutron interaction that has been proposed for , whose also exceeds 1.6.
- Received 21 May 2007
DOI:https://doi.org/10.1103/PhysRevC.76.044324
©2007 American Physical Society